/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */
package org.starapp.rbac.service.realm;

import java.util.ArrayList;
import java.util.List;
import javax.annotation.PostConstruct;
import org.apache.shiro.authc.AuthenticationException;
import org.apache.shiro.authc.AuthenticationInfo;
import org.apache.shiro.authc.AuthenticationToken;
import org.apache.shiro.authc.SimpleAuthenticationInfo;
import org.apache.shiro.authc.UsernamePasswordToken;
import org.apache.shiro.authc.credential.HashedCredentialsMatcher;
import org.apache.shiro.authz.AuthorizationException;
import org.apache.shiro.authz.AuthorizationInfo;
import org.apache.shiro.authz.SimpleAuthorizationInfo;
import org.apache.shiro.realm.AuthorizingRealm;
import org.apache.shiro.subject.PrincipalCollection;
import org.apache.shiro.util.ByteSource;
import org.springframework.beans.factory.annotation.Autowired;
import org.starapp.core.utils.Encodes;
import org.starapp.rbac.entity.Roles;
import org.starapp.rbac.entity.Users;
import org.starapp.rbac.service.UsersService;

public class ShiroDbRealm extends AuthorizingRealm {
	
	
	private UsersService usersService;
	
	@Autowired
	public void setUsersService(UsersService usersService) {
		this.usersService = usersService;
	}

	protected AuthorizationInfo doGetAuthorizationInfo(
			PrincipalCollection principals) {

		SimpleAuthorizationInfo info = new SimpleAuthorizationInfo();
		// 获取当前登录的用户名
		Users u = (Users) super.getAvailablePrincipal(principals);

		List<String> roles = new ArrayList<String>();
		List<String> permissions = new ArrayList<String>();
		Users user = usersService.getUsers(u.getUserId());
		if (user != null) {
			 if (user.getRolesM2MList() != null && user.getRolesM2MList().size() > 0) {
				for (Roles role : user.getRolesM2MList()) {
					roles.add(role.getRoleId());
//					if (role.getPmss() != null && role.getPmss().size() > 0) {
//						for (Permission pmss : role.getPmss()) {
//							if (!StringUtils.isEmpty(pmss.getPermission())) {
//								permissions.add(pmss.getPermission());
//							}
//						}
//					}
				}
			}
		} else {
			throw new AuthorizationException();
		}
		// 给当前用户设置角色
		info.addRoles(roles);
		// 给当前用户设置权限
		info.addStringPermissions(permissions);
		return info;

	}

	/**
	 * 认证回调函数,登录时调用.
	 */
	protected AuthenticationInfo doGetAuthenticationInfo(
			AuthenticationToken authcToken) throws AuthenticationException {
		UsernamePasswordToken token = (UsernamePasswordToken) authcToken;
		Users user = usersService.getUsers(token.getUsername());
		if (user != null) {
			byte[] salt = Encodes.decodeHex(user.getSalt());
			return new SimpleAuthenticationInfo(user,
					user.getPassword(), ByteSource.Util.bytes(salt), getName());
		} else {
			return null;
		}
	}
	/**
	 * 设定Password校验的Hash算法与迭代次数.
	 */
	@PostConstruct
	public void initCredentialsMatcher() {
		HashedCredentialsMatcher matcher = new HashedCredentialsMatcher(UsersService.HASH_ALGORITHM);
		matcher.setHashIterations(UsersService.HASH_INTERATIONS);
		setCredentialsMatcher(matcher);
	}
}
